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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd18dc342261916063cce2d37bf35addd8867e3894affc9194b849997757bbe31' 
  AND token = 'nPAn/Qk2UAvr24FQ31Y19y4zqBU+btTIjYdNp9VVRQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}